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TLCWT — Black Wall Thimble

How to Specify

Using tables from the National Fuel Gas Code or our Sizing & Application Guide, determine the diameter of venting required. The Sizing & Application Guide also offers tips on good design including multi-appliance system sizing and design. The System Design and Installation Guide is an additional resource.

TLCWT — Black Wall Thimble


  • Used in a wall support installation.
  • Radiation shield is included with spacers, which maintain the mandatory 2-inch clearance to combustibles.
  • Attractive matte black finishing trim is included with stylish brass finish.
  • Adjustable wall thickness from 4½” to 8¾” for 5” to 8” sizes and from 6” to 11” for 10” to 14” sizes.
  • 10” to 14” sizes have a round face plate without brass trim.

AV_TLCWT_Black Wall Thimble

Available sizes (inches)

5TLCWT5"7 1/816
6TLCWT6"8 1/816
7TLCWT7"9 1/816
8TLCWT8"10 1/816
10TLCWTB10"12 1/818
12TLCWTB12"14 1/820
14TLCWTB14"16 1/824